Can someone help me determine if a specific text is included in a string? For example, I have a string
str = "car, bicycle, bus"
and another string
str2 = "car"
I need to verify if str2 exists within str.
I'm new to JavaScript so I appreciate your patience :)
Best regards
if(str.includes(str2)) {
...
}
If you prefer using regular expressions:
if(new RegExp(str2).test(str)) {
...
}
Just be cautious of escaping metacharacters if you choose the regex route, as it may cause issues.
ES5 vs ES6
In ES5:
if(str.indexOf(str2) >= 0) {
...
}
In ES6:
if (str.includes(str2)) {
}
str.lastIndexOf(str2) >= 0; This code snippet should be functional, although it has not been tested yet.
let str = "car, bycicle, bus";
let str2 = "car";
console.log(str.lastIndexOf(str2) >= 0);Utilize the built-in .includes() method in JavaScript to verify the presence of a sub-string.
This method returns a boolean value, indicating whether the sub-string is found within the main string or not.
const mainString = "hello everyone";
const subStr = "everyone";
console.log(mainString.includes(subStr));
if(mainString.includes(subStr)){
// ADD YOUR CODE HERE
}
Kindly utilize the following:
let str = "hello";
alert(str.indexOf("lo") > -1);
Here is a simple way to check if a string contains another string:
'a lovely string'.includes('lovely')
This specific function is designed to determine the presence of a particular substring within a given string and also count how many times it appears.
const findTextInString = (substring, mainString) => {
const text = new RegExp(substring, 'g');
const occurrences = mainString.match(text) ?? [];
return [occurrences.length > 0, occurrences.length]
}
console.log(findTextInString("is", "This cow jumped over this moon"))If you are looking to determine if a specific word is present within a string, you can utilize the indexOf method. However, standard methods may not yield accurate results. For instance:
str = "carpet, bycicle, bus"
str2 = "car"
What you want car word is found not car in carpet
if(str.indexOf(str2) >= 0) {
// This condition remains true
}
// Alternatively
if(new RegExp(str2).test(str)) {
// This condition also remains true
}
To enhance the accuracy of regex matching, consider refining the pattern slightly:
str = "carpet, bycicle, bus"
str1 = "car, bycicle, bus"
stringCheck = "car"
// Expected result - false
if(new RegExp(`\b${stringCheck}\b`).test(str)) {
}
// Expected result - true
if(new RegExp(`\b${stringCheck}\b`,"g").test(str1)) {
}
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